| attr.tree:: | |
| A reference to a tree in the repository from which to read attributes, | |
| instead of the `.gitattributes` file in the working tree. In a bare | |
| repository, this defaults to `HEAD:.gitattributes`. If the value does | |
| not resolve to a valid tree object, an empty tree is used instead. | |
| When the `GIT_ATTR_SOURCE` environment variable or `--attr-source` | |
| command line option are used, this configuration variable has no effect. |